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#include <iostream>
int t;
std::string ans;
void CountPoints(int test, std::string ans);
int main()
{
        std::cin >> t;
        std::cin >> ans;
        CountPoints(t, ans);
}
void CountPoints(int test, std::string ans) {
    int points = 0;
    for (int i = 0; i < ans.length() - 1; i+=2) {
        if (ans[i] == 'T' && ans[i + 1] == 'T')
            points++;
    }

    std::cout << points;
}